This image displays the velvety-like area of darkened pigment typical of acanthosis nigricans.
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Below is more information about conditions common in the armpit of children. Since the armpit is exposed to chemical irritants such as soap and deodorant, itchy rashes called dermatitis commonly form in this area. The armpit may also have moles (formally known as nevi). Acanthosis nigricans, which is a thickening and darkening of the skin that is typically found in obese people, is commonly found in this area. To read about which children are most at risk and self-care measures for these and other diseases, click any of the photos below.